WinXP and region free patch for Liteon DVD

having installed two operating systems in my rig, winxp english and, for my significant half, winxp thai. my question is if i apply region free patch, say rpcde2, to my liteon 166s drive, do i have to do it twice or once in any of the operating system i installed in my computer?
thank you.

AFAIK, use LtnRPC (check and make sure yuor drive is compatible first, see Tools ticky for more info) and you will only have to do it once to the drive. It’s written to the hardware itself.